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what's the meaning of '=?' in angularJS directive isolate scope declaration?

Does the question mark after equals have special meaning? ie: 1 Answer 1 ...
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Unique fields that allow nulls in Django

...has field bar. The bar field should be unique, but allow nulls in it, meaning I want to allow more than one record if bar field is null , but if it is not null the values must be unique. ...
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Do Facebook Oauth 2.0 Access Tokens Expire?

I am playing around with the Oauth 2.0 authorization in Facebook and was wondering if the access tokens Facebook passes out ever expire. If so, is there a way to request a long-life access token? ...
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MongoDB inserts float when trying to insert integer

How do I get Mongo to insert an integer? 4 Answers 4 ...
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Cannot get to $rootScope

The following file "works" (the sense that it does not throw any errors): 3 Answers 3 ...
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What does the 'L' in front a string mean in C++?

...simple char. In daily use you don't need to use wchar_t, but if you are using windows.h you are going to need it. share | improve this answer | follow | ...
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Which machine learning classifier to choose, in general? [closed]

Suppose I'm working on some classification problem. (Fraud detection and comment spam are two problems I'm working on right now, but I'm curious about any classification task in general.) ...
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What is the mouse down selector in CSS?

I have noticed that buttons and other elements have a default styling and behave in 3 steps: normal view, hover/focus view and mousedown/click view, in CSS I can change the styling of normal view and hover view like this: ...
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Prevent ViewPager from destroying off-screen views

I have a ViewPager hooked up to a FragmentPagerAdapter that's displaying three fragments. The ViewPager appears to destroy a hosted fragment's view when it is more than one swipe away from the current position. ...
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how to avoid a new line with p tag?

How can I stay on the same line while working with <p> tag? 5 Answers 5 ...